A new energy automobile battery box vacuum adsorption air tightness detection device

Abstract

This invention relates to the field of airtightness testing technology, and in particular to a vacuum adsorption airtightness testing device for a new energy vehicle battery box. The device includes a testing box, a testing frame mounted on top of the testing box, a battery box shell, and a helium mass spectrometer leak detector. A surrounding testing assembly is installed at the top of the testing frame. A testing plate within the surrounding testing assembly reciprocates at the center of the top of the battery box shell. Inside the testing frame, a swing testing assembly is installed at the sealing points of the upper and lower covers of the battery box shell. This invention utilizes the movement trajectory of the movable column in the surrounding testing assembly, combined with the testing plate, to drive a fixed helium spray gun to rotate around the top of the battery box shell. This ensures that the fixed helium spray gun maintains an optimal constant distance from the top contour of the battery box shell. The wave-like swing effectively covers the corners and curved areas of the battery box cover, achieving efficient full-coverage testing of complex sealing surfaces. By manipulating the arc-shaped spiral blades in the dispersion assembly, the helium concentration around the outer periphery of the battery box shell is uniformly and stably covered, improving the testing effect.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, and in particular to a vacuum adsorption airtightness testing device for battery boxes of new energy vehicles. Background Technology

[0002] As one of the important components of new energy vehicles, new energy batteries can directly provide power for new energy vehicles. Therefore, the quality of the battery can directly affect the overall usability of the vehicle. In terms of physical structure, new energy batteries consist of a battery box and battery packs stacked inside the battery box. To ensure the safe and stable use of the entire battery, the sealing of the battery box is very important. Therefore, the battery box needs to undergo airtightness testing before it is put into use.

[0003] Currently, when workshop workers perform airtightness testing on battery boxes, they first evacuate the inside of the battery box and then use a helium mass spectrometer leak detector to achieve airtightness testing. After evacuation, workshop workers need to hold a helium spray gun and spray helium along the sealing openings, interfaces, and welds of the battery box. If there is a leak in the battery box, helium will enter the helium mass spectrometer leak detector, and the detector will automatically alarm. However, this airtightness testing method is relatively inefficient and increases the labor intensity of workshop workers, which is time-consuming and labor-intensive. In the method of covering the entire battery box with helium for testing, the amount of helium is relatively large, resulting in a large waste of resources. Moreover, it is impossible to accurately locate the leak in the battery box, which reduces the effectiveness of airtightness testing. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a vacuum adsorption airtightness detection device for new energy vehicle battery boxes.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vacuum adsorption airtightness testing device for a new energy vehicle battery box, comprising a testing box, a testing frame installed on the top of the testing box, a battery box shell, and a helium mass spectrometer leak detector. A surround testing assembly is provided at the top of the testing frame. A testing plate in the surround testing assembly reciprocates at the center of the top of the battery box shell. A fixed helium spray gun is provided at the bottom of the testing plate for horizontal surround testing of the top joint and weld of the battery box shell. An oscillating testing assembly is provided inside the testing frame at the sealing area of ​​the upper and lower covers of the battery box shell. A movable helium spray gun in the oscillating testing assembly performs up-and-down wave-shaped oscillation testing along the sealing area of ​​the battery box shell.

[0006] At the bottom of both ends of the detection plate, there are support plates that move on both sides of the battery box shell via diagonal rods. The top of the support plates is equipped with a dispersing and agitating component that distributes the helium gas sprayed from the movable helium gun. The arc-shaped spiral blades in the dispersing and agitating component disperse the helium gas sprayed from the movable helium gun, so that the helium gas covers the sealed outer periphery of the battery box shell. At the top of the inner side of the detection box, there is also a clamping and positioning component for positioning and detecting the battery box shell.

[0007] As a preferred embodiment of the present invention, a helium mass spectrometer leak detector is fixedly installed inside the detection box by bolts, and an auxiliary vacuum pump body is fixedly installed at the bottom of the helium mass spectrometer leak detector in the detection box. The battery box shell is provided with a vent valve. The surrounding detection assembly also includes a rotary motor and a transmission belt. The inner top of the detection frame is connected to a first pulley and a second pulley by a rotating shaft, and a transmission belt is connected between the first pulley and the second pulley. The top of the detection frame is fixedly installed with a rotary motor by a motor plate, and the first pulley is installed at the output end of the rotary motor by a rotating shaft.

[0008] The testing frame is internally fixed with a sliding guide rail by bolts. The sliding guide rail is slidably connected to a limit slider. The top of the limit slider is fixed with a connecting plate by bolts, and the connecting plate is fixed at both ends of the testing plate. An arc-shaped movable groove is opened in the center of the testing plate. A movable plate is fixedly installed on the outside of the transmission belt. A movable column matching the size of the arc-shaped movable groove is fixedly installed at the bottom of the movable plate. The movable column moves in the arc-shaped movable groove. The movable column, in conjunction with the arc-shaped movable groove, drives the testing plate to reciprocate on the sliding guide rail. A fixed helium spray gun is fixedly installed at the bottom of the movable column, with the nozzle of the fixed helium spray gun facing the side of the battery box shell.

[0009] As a preferred embodiment of the present invention, the swing detection assembly further includes a rotating disk movable at the bottom of the support plate. A support base is fixedly installed at the bottom of the support plate at the end away from the inclined rod. The support base is movably connected to a support shaft that drives the rotating disk to move. The rotating disk is fixedly installed at the top of the support shaft. A swing cylinder is movably connected between the bottoms of the inclined rods through the shaft. Swing arms are fixedly installed at both ends of the swing cylinder. A swing rod is fixedly installed at the end of the swing arm away from the swing cylinder.

[0010] The swing rod is movably sleeved with a swing ring, and a T-shaped limiting ring is fixedly installed on the side of the swing ring away from the swing cylinder. The rotating disk has a turning hole, and the T-shaped limiting ring moves in the turning hole. A movable helium spray gun is fixedly installed at the center of the side of the swing cylinder away from the swing rod.

[0011] As a preferred embodiment of the present invention, the agitator assembly further includes an active gear that drives the rotating disk and the arc-shaped spiral blade to move. A connecting shaft is movably connected to the support plate. A first bevel gear is fixedly installed at the bottom end of the connecting shaft. A second bevel gear is fixedly installed on the support shaft, and the second bevel gear is movably meshed with the first bevel gear. The active gear is fixedly installed at the top end of the connecting shaft. A rack plate is fixedly installed inside the detection frame by bolts, and the rack plate is movably meshed with the active gear.

[0012] The support plate is connected to a base plate via a connecting plate at one end near the inclined rod. A base shaft is movably connected to the top center of the base plate, and a connecting gear is fixedly installed on the base shaft. The connecting gear and the driving gear are movably meshed. Several arc-shaped spiral blades are evenly installed on the top of the connecting gear on the base shaft.

[0013] As a preferred embodiment of the present invention, the clamping and positioning assembly includes a positioning frame installed inside the detection box. A servo motor is fixedly installed at the bottom of the positioning frame. The output end of the servo motor is connected to a positioning disk via a rotating shaft. The positioning disk has an arc-shaped connecting groove, and an arc-shaped positioning rod is movably connected in the arc-shaped connecting groove. A positioning block is fixedly installed at the top of the arc-shaped positioning rod, and a limit rod is fixedly installed inside the positioning frame. Both ends of the positioning block movably pass through the limit rod. A T-shaped clamping plate is fixedly installed at the top of each positioning block, and the T-shaped clamping plate movably moves to the top outer side of the positioning frame. The top of the positioning frame has a positioning groove that matches the size of the T-shaped clamping plate, and the bottom of the T-shaped clamping plate movably passes through the positioning groove.

[0014] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0015] 1. In this invention, the movement trajectory of the movable column in the surrounding detection component, in conjunction with the detection plate, drives the fixed helium spray gun to move around the top of the battery box shell, ensuring that the fixed helium spray gun always maintains the optimal constant distance from the top contour of the battery box shell, achieving uniform coverage and effective concentration of helium. The swing cylinder in the swing detection component drives the movable helium spray gun to perform waveform helium spraying at the sealing area. The waveform swing can effectively cover the corners and curved areas of the battery box cover, achieving efficient full coverage detection of complex sealing surfaces. By moving the arc-shaped spiral blade in the dispersion component, the helium concentration coverage around the outer periphery of the battery box shell is uniform and stable, improving the detection effect.

[0016] 2. In this invention, the movable column in the surrounding detection component, driven by the transmission belt, drives the fixed helium spray gun to perform helium spray detection around the top of the battery box shell. The core of the automated surrounding helium spray detection technology includes a precision detection component surrounding the battery box shell. The movable column inside is driven by a high-precision transmission belt to perform a programmable circumferential scanning motion. The fixed helium spray gun, fixed on the movable column, moves synchronously and continuously and evenly sprays helium tracer gas into the high-risk areas around the top of the battery box shell, including the circumferential sealing welds, high-voltage connection ports, peripheral welds, and other top accessory interface seals.

[0017] 3. In this invention, the rotating disk is driven to rotate by the support shaft in the swing detection component. The rotating disk drives the swing rod to swing through the actuation hole in conjunction with the T-shaped limiting ring and the swing ring. The swing rod drives the swing cylinder at the bottom of the inclined rod to swing synchronously through the swing arm. The movable helium spray gun on the swing cylinder will swing in a wave pattern. The helium sprayed by the movable helium spray gun will be sprayed out for detection at the upper and lower sealing areas of the battery box shell. During the wave pattern swing, the movable helium spray gun dynamically covers the upper and lower sealing surfaces of the battery box shell at a constant distance. The wave pattern swing can effectively cover the corners and curved areas of the box body, upgrading simple rotation to three-dimensional composite waveform scanning. While ensuring the helium detection sensitivity, it can achieve efficient full coverage detection of complex sealing surfaces.

[0018] 4. In this invention, the base shaft of the dispersing assembly rotates, causing the top arc-shaped spiral blade to rotate. During the rotation, the arc-shaped spiral blade disperses the helium gas sprayed from the active helium gun, ensuring that the helium gas is evenly distributed to the sealed area of ​​the battery box shell for detection. This improves the detection effect on the sealed area of ​​the battery box shell 11. The turbulent flow field of the arc-shaped spiral blade eliminates the concentration difference between the spray center and the edge, shortening the helium diffusion response time. This results in high efficiency in detecting leaks in the battery box shell and fast response to airtightness detection.

[0019] 5. In this invention, a stable and smooth linear drive is provided by the drive belt surrounding the detection component. Compared with overall helium filling or vacuum chamber helium testing, local helium injection significantly reduces helium consumption and detection costs. At the same time, it shortens the waiting time for vacuuming or helium filling, improves the detection cycle, and is more suitable for the fast pace of production lines. Combined with a high-sensitivity helium mass spectrometer leak detector, it can accurately locate tiny leaks in welds or sealing surfaces at the same time or shortly after helium injection, providing clear guidance for rework. The entire scanning and helium injection process is fully automated, eliminating human error and ensuring high consistency and repeatability of detection between different workpieces. The surrounding design and the flexibility of the movable column allow it to adapt to the complex curved surfaces and geometries of the top of different battery box models.

[0020] 6. In this invention, the positioning disk is driven to rotate by a servo motor. The positioning disk drives the positioning block on the limit rod to move relative to each other through the arc-shaped connecting groove and the arc-shaped positioning rod. During the relative movement, the positioning block drives the T-shaped clamping plate to move synchronously through the positioning groove. The T-shaped clamping plate is used to center and clamp the bottom of the battery box shell. The adaptive mechanism eliminates the traditional tooling change time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the detection frame of the present invention;

[0023] Figure 3 This is a schematic diagram of the transmission belt structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the detection plate of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the swing cylinder of the present invention;

[0026] Figure 6 This is a schematic diagram of the supporting shaft structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the base plate of the present invention;

[0028] Figure 8 This is a schematic diagram of the rotating disk of the present invention;

[0029] Figure 9 This is a schematic diagram of the positioning frame of the present invention;

[0030] Figure 10 This is a schematic diagram of the positioning disk of the present invention.

[0031] The components include: 10. Detection box; 11. Battery box shell; 12. Helium mass spectrometer leak detector; 13. Auxiliary vacuum pump; 14. Vent valve; 20. Detection frame; 21. Sliding guide rail; 22. Limiting slider; 23. Connecting plate; 24. Rotary motor; 25. Motor plate; 26. Rack plate; 30. Transmission belt; 31. First pulley; 32. Second pulley; 33. Movable plate; 34. Movable column; 35. Detection plate; 36. Arc-shaped movable groove; 37. Fixed helium spray gun; 40. Support plate; 41. Support base; 42. Support shaft; 43. Connecting shaft; 44. First... 45. Bevel gear; 46. Second bevel gear; 50. Drive gear; 51. Slant bar; 52. Swing cylinder; 53. Swing arm; 54. Swing rod; 55. Swing ring; 56. T-shaped limit ring; 57. Rotary disk; 58. Actuating hole; 60. Movable helium spray gun; 61. Connecting plate; 62. Base plate; 63. Base shaft; 64. Connecting gear; 75. Arc-shaped spiral blade; 76. Positioning frame; 77. Servo motor; 78. Positioning disk; 79. Arc-shaped connecting groove; 70. Arc-shaped positioning rod; 71. Positioning block; 72. Limiting rod; 73. T-shaped clamping plate; 74. Positioning groove. Detailed Implementation

[0032] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0033] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9As shown, the device includes a detection housing 10, a detection frame 20 mounted on top of the detection housing 10, a battery casing 11, and a helium mass spectrometer leak detector 12. A surround detection assembly is installed at the top of the detection frame 20. A detection plate 35 within the surround detection assembly reciprocates at the center of the top of the battery casing 11. A fixed helium spray gun 37 is installed at the bottom of the detection plate 35 to perform horizontal surround detection of the top joints and welds of the battery casing 11. The helium mass spectrometer leak detector 12 is bolted and installed inside the detection housing 10, and a fixed device is installed at the bottom of the helium mass spectrometer leak detector 12 within the detection housing 10. The battery housing 11 is equipped with an auxiliary vacuum pump body 13 and a vent valve 14. The vent valve 14 works in conjunction with the auxiliary vacuum pump body 13 to evacuate the inside of the battery housing 11. The surrounding detection assembly also includes a rotary motor 24 and a transmission belt 30. The inner top of the detection frame 20 is connected to a first pulley 31 and a second pulley 32 via a rotating shaft, and a transmission belt 30 is connected between the first pulley 31 and the second pulley 32. The rotary motor 24 is fixedly mounted on the top of the detection frame 20 via a motor plate 25, and the first pulley 31 is mounted on the output end of the rotary motor 24 via a rotating shaft.

[0034] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9 The detection frame 20 is internally fixed with a sliding guide rail 21 by bolts. The sliding guide rail 21 is slidably connected to a limit slider 22. The top of the limit slider 22 is fixed with a connecting plate 23 by bolts. The connecting plate 23 is fixedly installed at both ends of the detection plate 35. An arc-shaped movable groove 36 is opened at the center of the detection plate 35. A movable plate 33 is fixedly installed on the outside of the transmission belt 30. A movable column 34 matching the size of the arc-shaped movable groove 36 is fixedly installed at the bottom of the movable plate 33. The movable column 34 moves in the arc-shaped movable groove 36 and drives the detection plate 35 to move. The movable column 34, in conjunction with the arc-shaped movable groove 36, drives the detection plate 35 to reciprocate on the sliding guide rail 21. A fixed helium spray gun 37 is fixedly installed at the bottom of the movable column 34. The nozzle of the fixed helium spray gun 37 faces the side of the battery box shell 11. The helium spray method is used to detect leaks in the battery box shell 11.

[0035] Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9The first pulley 31 is driven to rotate by the rotary motor 24 on the motor plate 25. The first pulley 31, in conjunction with the second pulley 32, causes the transmission belt 30 to rotate around the top of the battery box housing 11. The transmission belt 30 drives the movable column 34 to move synchronously via the movable plate 33. When the movable column 34 is located between the first pulley 31 and the second pulley 32, it is positioned at both ends of the arc-shaped movable groove 36 of the detection plate 35. When the movable column 34 moves to the side of the first pulley 31 and the second pulley 32, it will move on the movable plate 33. The movable column 34 moves from one end of the arc-shaped movable groove 36 to the other end of the arc-shaped movable groove 36. Under the movement of the transmission belt 30, the movable column 34 cooperates with the arc-shaped movable groove 36 to make the detection plate 35 reciprocate horizontally under the action of the limiting guide rail, the limiting slider 22 and the connecting plate 23, so that the detection plate 35 moves back and forth at the top of the battery box shell 11. Under the movement of the movable column 34 in conjunction with the transmission belt 30, the fixed helium spray gun 37 performs helium spray detection on the top periphery of the battery box shell 11, and performs uniform helium spray detection on the top power connection port and weld of the battery box shell 11.

[0036] See Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 Inside the testing frame 20, a swing detection assembly is provided at the sealing points of the upper and lower covers of the battery box housing 11. A movable helium-spraying gun 58 within the swing detection assembly performs up-and-down wave-like swing detection along the sealing points of the battery box housing 11. The swing detection assembly also includes a rotating disk 56 movable at the bottom of the support plate 40. A support base 41 is fixedly installed at the bottom of the support plate 40 at the end away from the inclined rod 50. The support base 41 is movably connected to a support shaft 42 that drives the rotating disk 56, and the rotating disk 56 is fixedly installed at the top of the support shaft 42. The bottoms of the inclined rods 50 are connected... A swing cylinder 51 is movably connected via a pivot, and swing arms 52 are fixedly installed at both ends of the swing cylinder 51. A swing rod 53 is fixedly installed at the end of the swing arm 52 away from the swing cylinder 51. The swing arm 52 is movably inside the inclined rod 50. A swing ring 54 is movably sleeved on the swing rod 53. A T-shaped limiting ring 55 is fixedly installed on the side of the swing ring 54 away from the swing cylinder 51. A turning hole 57 is opened on the rotating disk 56, and the T-shaped limiting ring 55 is movably in the turning hole 57. A movable helium spray gun 58 is fixedly installed at the center of the side of the swing cylinder 51 away from the swing rod 53.

[0037] See Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The inclined rod 50 drives the support plate 40 to move back and forth on both sides of the battery box shell 11. The drive gear 46 at the top of the support plate 40 meshes with the rack plate 26 inside the detection frame 20, thereby driving the drive gear 46 to rotate. The drive gear 46 drives the first bevel gear 44 to rotate through the connecting shaft 43 on the support plate 40. The first bevel gear 44 meshes with the second bevel gear 45 to drive the support shaft 42 on the support seat 41 to move synchronously. The support shaft 42 drives the rotating disk 56 to rotate. The rotating disk 56 drives the swing rod 53 to swing through the actuation hole 57, in conjunction with the T-shaped limit ring 55 and the swing ring 54. The swing rod 53 drives the swing cylinder 51 at the bottom of the inclined rod 50 to swing synchronously through the swing arm 52. The movable helium spray gun 58 on the swing cylinder 51 will swing in a wave pattern. The helium sprayed by the movable helium spray gun 58 will swing and be sprayed out for detection at the upper and lower sealing points of the battery box shell 11.

[0038] See Figure 5 , Figure 6 , Figure 7 and Figure 8 At the bottom ends of the detection plate 35, support plates 40, which are movable on both sides of the battery housing 11, are connected by diagonal rods 50. The top of the support plates 40 is equipped with a dispersing and agitating assembly that distributes the helium gas ejected from the movable helium gun 58. The arc-shaped spiral blades 64 in the dispersing and agitating assembly disperse the helium gas ejected from the movable helium gun 58, ensuring that the helium gas covers the sealed outer periphery of the battery housing 11. The dispersing and agitating assembly also includes a drive gear 46 that drives the rotating disk 56 and the arc-shaped spiral blades 64. A connecting shaft 43 is movably connected to the support plates 40. A first bevel gear 44 is fixedly installed at the bottom end of the connecting shaft 43. A second bevel gear 45 is fixedly installed on the support shaft 42, and the second bevel gear 45 is connected to the first bevel gear 44. The active gear 46 is fixedly installed at the top of the connecting shaft 43. The rack plate 26 is fixedly installed inside the detection frame 20 by bolts, and the rack plate 26 is movably meshed with the active gear 46. The support plate 40 is connected to the base plate 61 by the connecting plate 60 at one end near the inclined rod 50. The base shaft 62 is movably connected at the top center of the base plate 61, and the connecting gear 63 is fixedly installed on the base shaft 62. The connecting gear 63 is movably meshed with the active gear 46. Several arc-shaped spiral blades 64 are evenly installed on the top of the connecting gear 63 on the base shaft 62. The arc-shaped spiral blades 64 disperse the sprayed helium gas, so that the helium gas is fully distributed to the leakage point of the battery box shell 11.

[0039] See Figure 5 , Figure 6 , Figure 7 and Figure 8When the drive gear 46 rotates, it will also mesh with the connecting gear 63 to drive the base shaft 62 on the support plate 40 to rotate. During the rotation of the base shaft 62, the top arc-shaped spiral blade 64 will rotate. During the rotation of the arc-shaped spiral blade 64, the helium gas sprayed by the movable helium gun 58 will be fully dispersed, so that the helium gas is evenly distributed to the sealing part of the battery box shell 11 for detection, thereby improving the detection effect of the sealing part of the battery box shell 11.

[0040] See Figure 1 , Figure 2 , Figure 9 and Figure 10 The top of the detection chamber 10 is also equipped with a clamping and positioning assembly for positioning and detecting the battery case 11. The clamping and positioning assembly includes a positioning frame 70 installed inside the detection chamber 10. A servo motor 71 is fixedly installed at the bottom of the positioning frame 70. The output end of the servo motor 71 is connected to a positioning disk 72 via a rotating shaft. The positioning disk 72 has an arc-shaped connecting groove 73, and an arc-shaped positioning rod 74 is movably connected in the arc-shaped connecting groove 73. A positioning block 75 is fixedly installed at the top of the arc-shaped positioning rod 74, and a limit rod 76 is fixedly installed inside the positioning frame 70. Both ends of the positioning block 75 are movably inserted through the limiting rod 76. A T-shaped clamping plate 77 is fixedly installed on the top of the positioning block 75, and the T-shaped clamping plate 77 is movably inserted on the top outer side of the positioning frame 70. The top of the positioning frame 70 is provided with a positioning groove 78 that matches the size of the T-shaped clamping plate 77, and the bottom of the T-shaped clamping plate 77 is movably inserted through the positioning groove 78. The T-shaped clamping plate 77 centers the battery box shell 11 at the bottom center of the transmission belt 30, so that the fixed helium injection gun 37 and the movable helium injection gun 58 can perform helium injection detection on the leakage points of the battery box shell 11.

[0041] Figure 1 , Figure 2 , Figure 9 and Figure 10 The positioning disk 72 is driven to rotate by the servo motor 71. The positioning disk 72 drives the positioning block 75 on the limit rod 76 to move relative to each other through the arc-shaped connecting groove 73 and the arc-shaped positioning rod 74. During the relative movement, the positioning block 75 drives the T-shaped clamping plate 77 to move synchronously through the positioning groove 78. The T-shaped clamping plate 77 is used to center and clamp the bottom of the battery box shell 11.

[0042] Working principle: The workshop worker places the battery box shell 11 into the center of the inside of the testing frame 20. The positioning disk 72 is driven to rotate by the servo motor 71. The positioning disk 72 drives the positioning block 75 on the limit rod 76 to move relative to each other through the arc-shaped connecting groove 73 and the arc-shaped positioning rod 74. During the relative movement, the positioning block 75 drives the T-shaped clamping plate 77 to move synchronously through the positioning groove 78. The T-shaped clamping plate 77 is used to center and clamp the bottom of the battery box shell 11. After the positioning and clamping are completed, the auxiliary vacuum pump body 13 inside the testing box 10 is connected to the vent valve 14 on the battery box shell 11. The auxiliary vacuum pump body 13 is used to evacuate the inside of the battery box shell 11, so that the pressure inside the battery box shell 11 is less than the alarm value of the product or close to the stable value. The stop valve of the auxiliary vacuum pump body 13 is closed to realize the leak detection of the battery box shell 11.

[0043] The first pulley 31 is driven to rotate by the rotary motor 24 on the motor plate 25. The first pulley 31, in conjunction with the second pulley 32, causes the transmission belt 30 to rotate around the top of the battery box housing 11. The transmission belt 30 drives the movable column 34 to move synchronously via the movable plate 33. When the movable column 34 is located between the first pulley 31 and the second pulley 32, it is positioned at both ends of the arc-shaped movable groove 36 of the detection plate 35. When the movable column 34 moves to the side of the first pulley 31 and the second pulley 32, it will move on the movable plate 33. The movable column 34 moves from one end of the arc-shaped movable groove 36 to the other end of the arc-shaped movable groove 36. Under the movement of the transmission belt 30, the movable column 34 cooperates with the arc-shaped movable groove 36 to make the detection plate 35 reciprocate horizontally under the action of the limiting guide rail, the limiting slider 22 and the connecting plate 23, so that the detection plate 35 moves back and forth at the top of the battery box shell 11. Under the movement of the transmission belt 30, the movable column 34 drives the fixed helium spray gun 37 to perform helium spray detection on the top periphery of the battery box shell 11, and performs uniform helium spray detection on the top power connection port and weld of the battery box shell 11.

[0044] During the reciprocating motion of the detection plate 35, the support plate 40 is driven to move back and forth on both sides of the battery box shell 11 via the inclined rod 50. The active gear 46 at the top of the support plate 40 meshes with the rack plate 26 inside the detection frame 20, thereby driving the active gear 46 to rotate. The active gear 46 drives the first bevel gear 44 to rotate via the connecting shaft 43 on the support plate 40. The first bevel gear 44 meshes with the second bevel gear 45 to drive the support shaft 42 on the support seat 41 to move synchronously. The support shaft 42 drives the rotating disk 56 to rotate. The rotating disk 56 drives the swing rod 53 to swing through the actuation hole 57 in conjunction with the T-shaped limit ring 55 and the swing ring 54. The swing rod 53 drives the swing cylinder 51 at the bottom of the inclined rod 50 to swing synchronously via the swing arm 52. The movable helium spray gun 58 on the swing cylinder 51 will swing in a wave pattern. The helium sprayed by the movable helium spray gun 58 will swing and be sprayed out for detection at the upper and lower sealing points of the battery box shell 11.

[0045] Specifically, when the actuation hole 57 of the rotating disk 56 is located at both ends of the swing rod 53, the actuation hole 57 causes the T-shaped limiting ring 55 and the swing ring 54 to be at both ends of the swing rod 53. The swing rod 53, through the swing arm 52, keeps the swing cylinder 51 and the movable helium spray gun 58 under the inclined rod 50 in a horizontal state. When the actuation hole 57 of the rotating disk 56 is at both ends, the actuation hole 57 will, through the T-shaped limiting ring 55, keep the swing ring 54 at the middle position of the swing rod 53. At this time, the swing cylinder 51 and the movable helium spray gun 58 are in an inclined state. This process is repeated, so that the swing cylinder 51 and the movable helium spray gun 58 under the inclined rod 50 are in a wave-like oscillating motion state.

[0046] When the drive gear 46 rotates, it also engages with the connecting gear 63, driving the base shaft 62 on the support plate 40 to rotate. During the rotation of the base shaft 62, the top arc-shaped spiral blade 64 rotates. During the rotation of the arc-shaped spiral blade 64, the helium gas sprayed by the movable helium gun 58 is fully dispersed, so that the helium gas is evenly distributed to the sealing part of the battery box 11 for detection, thereby improving the detection effect of the sealing part of the battery box 11.

[0047] The ejected helium gas is located at the sealing point and port connection of the battery housing 11. At this time, the inside of the battery housing 11 is in a vacuum state. Once there is a sealing leak in the battery housing 11, the ejected helium gas will enter the helium mass spectrometer leak detector 12 inside the detection box 10. At this time, the helium mass spectrometer leak detector 12 will issue an alarm to remind that there is a leak in the battery housing 11.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A vacuum adsorption airtightness testing device for a new energy vehicle battery box, comprising a testing box, a testing frame mounted on top of the testing box, a battery box shell, and a helium mass spectrometer leak detector, characterized in that, The top of the testing frame is equipped with a surround testing assembly. The testing plate in the surround testing assembly reciprocates at the center of the top of the battery box shell. A fixed helium spray gun is provided at the bottom of the testing plate to perform horizontal surround testing on the top joint and weld of the battery box shell. Inside the testing frame, at the sealing area of ​​the upper and lower covers of the battery box shell, a swing testing assembly is provided. The movable helium spray gun in the swing testing assembly performs up and down wave swing testing along the sealing area of ​​the battery box shell. At the bottom of both ends of the detection plate, there are support plates that move on both sides of the battery box shell via diagonal rods. The top of the support plate is equipped with a dispersing component that distributes the helium gas sprayed by the movable helium gun. The arc-shaped spiral blades in the dispersing component disperse the helium gas sprayed by the movable helium gun, so that the helium gas covers the sealed outer periphery of the battery box shell. At the top of the inner side of the detection box, there is also a clamping and positioning component for positioning and detecting the battery box shell. The swing detection assembly also includes a rotating disk that is movable at the bottom of the support plate. A support base is fixedly installed at the bottom of the support plate at the end away from the inclined bar. The support base is movably connected to a support shaft that drives the rotating disk to move. The rotating disk is fixedly installed at the top of the support shaft. A swing cylinder is movably connected between the bottoms of the inclined bars through the shaft. Swing arms are fixedly installed at both ends of the swing cylinder. A swing rod is fixedly installed at the end of the swing arm away from the swing cylinder. The swing rod is movably connected to a swing ring, and a T-shaped limiting ring is fixedly installed on the side of the swing ring away from the swing cylinder. The rotating disk has a turning hole, and the T-shaped limiting ring moves in the turning hole. A movable helium spray gun is fixedly installed at the center of the side of the swing cylinder away from the swing rod.

2. The vacuum adsorption airtightness testing device for a new energy vehicle battery box according to claim 1, characterized in that, The detection chamber is equipped with a helium mass spectrometer leak detector fixed inside by bolts. An auxiliary vacuum pump is fixedly installed at the bottom of the helium mass spectrometer leak detector inside the detection chamber. The battery box is equipped with a vent valve. The surrounding detection assembly also includes a rotary motor and a transmission belt. The inner top of the detection frame is connected to a first pulley and a second pulley via a rotating shaft. A transmission belt connects the first pulley and the second pulley. The top of the detection frame is fixedly installed with a rotary motor via a motor plate. The first pulley is installed at the output end of the rotary motor via a rotating shaft.

3. The vacuum adsorption airtightness testing device for a new energy vehicle battery box according to claim 2, characterized in that, The testing frame is internally fixed with a sliding guide rail by bolts. The sliding guide rail is slidably connected to a limit slider. The top of the limit slider is fixed with a connecting plate by bolts, and the connecting plate is fixed at both ends of the testing plate. An arc-shaped movable groove is opened in the center of the testing plate. A movable plate is fixedly installed on the outside of the transmission belt. A movable column matching the size of the arc-shaped movable groove is fixedly installed at the bottom of the movable plate. The movable column moves in the arc-shaped movable groove. The movable column, in conjunction with the arc-shaped movable groove, drives the testing plate to reciprocate on the sliding guide rail. A fixed helium spray gun is fixedly installed at the bottom of the movable column, with the nozzle of the fixed helium spray gun facing the side of the battery box shell.

4. The vacuum adsorption airtightness testing device for a new energy vehicle battery box according to claim 1, characterized in that, The agitator assembly also includes a drive gear that drives the rotating disk and the arc-shaped spiral blade. A connecting shaft is movably connected to the support plate. A first bevel gear is fixedly installed at the bottom of the connecting shaft. A second bevel gear is fixedly installed on the support shaft, and the second bevel gear is movably meshed with the first bevel gear. The drive gear is fixedly installed at the top of the connecting shaft. A rack plate is fixedly installed inside the detection frame by bolts, and the rack plate is movably meshed with the drive gear.

5. The vacuum adsorption airtightness testing device for a new energy vehicle battery box according to claim 4, characterized in that, The support plate is connected to a base plate via a connecting plate at one end near the inclined rod. A base shaft is movably connected to the top center of the base plate, and a connecting gear is fixedly installed on the base shaft. The connecting gear and the driving gear are movably meshed. Several arc-shaped spiral blades are evenly installed on the top of the connecting gear on the base shaft.

6. The vacuum adsorption airtightness testing device for a new energy vehicle battery box according to claim 1, characterized in that, The clamping and positioning assembly includes a positioning frame installed inside the detection box. A servo motor is fixedly installed at the bottom of the positioning frame. The output end of the servo motor is connected to a positioning disk via a rotating shaft. The positioning disk has an arc-shaped connecting groove, and an arc-shaped positioning rod is movably connected in the arc-shaped connecting groove. A positioning block is fixedly installed at the top of the arc-shaped positioning rod, and a limit rod is fixedly installed inside the positioning frame. Both ends of the positioning block movably pass through the limit rod. A T-shaped clamping plate is fixedly installed at the top of each positioning block, and the T-shaped clamping plate movably moves to the top outside of the positioning frame. The top of the positioning frame has a positioning groove that matches the size of the T-shaped clamping plate, and the bottom of the T-shaped clamping plate movably passes through the positioning groove.

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